热带太平洋和印度洋海面高度季节循环和年际变化的数值模拟

利用卫星海面高度计资料,分析了赤道太平洋和印度洋海面高度变化的季节和年际变化特征,并与一个耦合气候系统模式FGCM0模拟的海面高度进行比较,评估模式模拟海面高度季节和年际变化的能力.结果表明,尽管耦合模式存在一定的系统误差,但仍然能在相当程度上模拟出海面高度季节和年际变化的基本特征.同时为检验模式中印度尼西亚贯穿流(ITF)对海面高度季节和年际变化的影响,还进行了印度尼西亚海道完全关闭的敏感性试验,与控制试验结果对比表明,印度尼西亚贯穿流可以显著影响热带太平洋和印度洋年际变化的特征.

Numerical Simulation of Seasonal Cycle and Interannual Variation of Sea Surface Height in the Tropical Pacific and Indian Oceans

The seasonal cycle and interannual variation of sea surface height from TOPEX/Poseidon and ERS 1/2 are analyzed in the tropical Pacific and Indian Oceans, and they are compared with those from a coupled climate model FGCM0 in order to assess the ability of the model to simulate seasonal cycle and interannual variation in sea level height. The results show that although there are somewhat systematic errors in the coupled model, the model simulates the basic features of seasonal cycle and interannual variability of sea surface height to the considerable extent. In order to examine the impact of Indonesian Through Flow (ITF) on the seasonal cycle and interannual variation of sea surface height, a sensitivity experiment is accomplished, in which the Indonesian passage is closed fully in the coupled model. Comparison between control and sensitivity experiments suggests that ITF modifies significantly interannual variation of sea surface height in the tropical Pacific and Indian Oceans.